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x in (-oo:+oo)
2/5-x+2 = (3/10)*x-1 // - (3/10)*x-1
2/5-x-((3/10)*x)+1+2 = 0
(-3/10)*x-x+2/5+1+2 = 0
17/5-13/10*x = 0 // - 17/5
-13/10*x = -17/5 // : -13/10
x = -17/5/(-13/10)
x = 34/13
x = 34/13
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